Portable oxygen supply apparatus



FIG. 1 is a front, top and left side perspective view of a portable oxygen supply apparatus, showing my new design;

FIG. 2 is a rear bottom and right side perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a front side elevational view thereof; and,

FIG. 7 is a rear side elevational view thereof. 

The ornamental design for a portable oxygen supply apparatus, as shown and described. 